Side by Side banner like this one..

[BirdOPrey5]

There's probably a better table-less implementation but off hand the following should work:

<table border="0" width="90%">
   <tr>
       <td width="40%">
            <div align="left"><a href="..."><img src="..." border="0" /></a></div>
        </td>
        <td width="20%">&nbsp;</td>
       <td width="40%">
            <div align="right"><a href="..."><img src="..." border="0" /></a></div>
        </td>
   </tr>
</table>

You need to fill in the ... with the URL of the link and the images as needed...
You could play with the exact percentages to to better suit your needs... the <table> width is the overall width and the 3 <td> widths must add to 100%.